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			37 lines
		
	
	
		
			918 B
		
	
	
	
		
			HTML
		
	
	
	
	
	
<p>给你一个由若干括号和字母组成的字符串 <code>s</code> ,删除最小数量的无效括号,使得输入的字符串有效。</p>
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<p>返回所有可能的结果。答案可以按 <strong>任意顺序</strong> 返回。</p>
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<p> </p>
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<p><strong>示例 1:</strong></p>
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<pre>
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<strong>输入:</strong>s = "()())()"
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<strong>输出:</strong>["(())()","()()()"]
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</pre>
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<p><strong>示例 2:</strong></p>
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<pre>
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<strong>输入:</strong>s = "(a)())()"
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<strong>输出:</strong>["(a())()","(a)()()"]
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</pre>
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<p><strong>示例 3:</strong></p>
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<pre>
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<strong>输入:</strong>s = ")("
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<strong>输出:</strong>[""]
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</pre>
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<p> </p>
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<p><strong>提示:</strong></p>
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<ul>
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	<li><code>1 <= s.length <= 25</code></li>
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	<li><code>s</code> 由小写英文字母以及括号 <code>'('</code> 和 <code>')'</code> 组成</li>
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	<li><code>s</code> 中至多含 <code>20</code> 个括号</li>
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</ul>
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